384 W. D. FUNKHOUSER 



No evidence has been found to indicate that nymphs of any stage survive 

 the winter months. This is not surprising when-the life habits of the insects 

 and the severity of the local winters are considered. 



It may be that even in the case of species known to pass the winter in 

 the egg stage some adults may survive likewise; but as a general rule it has 

 been taken for granted that if winter eggs are commonly found the species 

 depends on this method of hibernation for existence. 



LIFE CYCLE 



Summarizing in a general way the usual life history of the local species, 

 the following outline may be considered correct: 



Eggs: Laid in fall, hatch in early spring. 



Nymphs : Emerge about the middle of May and require about six weeks 

 to reach maturity. 



Adults: Are common about Jul}^ 1 and persist thruout summer and fall. 



Mating: Takes place the first week after emergence. 



Oviposition : Occurs within a week after mating. 



Broods: Usually one but sometimes more, dependent on weather con- 

 ditions. 



For a single individual the life cycle would be somewhat as follows: 



Egg stage: From September to middle of May 8| months 



[ Fii'st instar ^ 1 week 



I Second instar ' 1 week 



Nymph: -j Third instar 1 week 



I Fourth instar 1 week 



[ Fifth instar 2 weeks 



Total — from middle of May to July 1| months 



Adult : From July to October (inclusive) 4 months 



Entire life 14 months 



LOCALITIES FOR COLLECTING 

 The following table has been prepared to show the best collecting 

 grounds m the basin for the various sfx^cies as shown 133^ the collecting 

 in recent years. For each species are given the station that has yielded 

 the species most abundantly, the dates of the appearance in largest numbers 

 of both nymphs and adults, the hosts on which the species has most 

 commonly been taken, and notes as to the relative abundance of the forms 



